SANTA ANA, Calif. (AP) — Lab results show a holiday sweet bread that caused dozens of people to be ill was deliberately laced with a synthetic drug that mimics the active ingredient in marijuana.

The Orange County Register reports (http://bit.ly/1AS5AGC ) Wednesday that S&N Laboratories tested a sample of the Three Kings Day bread and found it was contaminated with a substantial amount of synthetic cannabinoid, which is an artificial THC with intensified effects.

The newspaper hired the lab to test a sample obtained from one of the more than 40 people who got sick last week with heart palpitations, dizziness and hallucinations.

Owners of Cholula’s Bakery in Santa Ana, which distributed the bread to nine stores, couldn’t be reached for comment.

Santa Ana police are investigating as the county awaits its own detailed lab results.